body {
    padding-top: 20px;
    padding-bottom: 20px;
    background-color: #f8f9fa;
}

.card {
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.card-header {
    border-top-left-radius: 8px !important;
    border-top-right-radius: 8px !important;
    font-weight: bold;
}

.alert {
    border-radius: 6px;
}

.btn {
    border-radius: 6px;
}

footer {
    background-color: #343a40;
    color: white;
    padding: 20px 0;
}

/* 响应式调整 */
@media (max-width: 768px) {
    body {
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .card-body {
        padding: 15px;
    }
}